Air pump



NOV. 10, 1931. L SPlRA 1,831,756

. AIR PUMP Filed Aug. 16, 1929 Patented Nov. 10, 1931 gUNITED STATES PATENT orricr.

p :.Eoronn sPIaA, or ZURICH, SWITZERLAND Ain PUMP AppIication led August 16, 1929, Serial No.

The subject of the'present invention is a pneumatic pump which is distinguished by the fact that the pump barrel is over a part at least of its length surrounded by a jacket standing away'from the barrel, the hollow space between the jacket and the barrel serv ing as air vessel'.

On the drawing annexed a constructional example of the subject of the invention shown in a longitudinal section.

In the pump barrel l, a piston 3, with rod V4, can be moved to and fro by means of a removable handle 2; around the pump barrel and standing away from it, a jacket 5 is provided so that between the pump barrel and the jacket 5, a hollow space forms. In this hollow space a spiral tube 6 is arranged which serves as air vessel. This tube 6 is in com-munication by its lower end, through an air duct 7. a valve 8 and an yair duct l0, provided in the foot 9 of the pump, with the lower endv munication with the outer air, a valve be-` ing arranged between the ducts 7 and 13. This duct 13 serves the purpose of being able to lill the air vessel of the pumps from any source of compressed air, fory example from a motor, without actuating the pump. Y In this case the valve 8 prevents the entry of jair into the pump barrel l. Y

The spiral tube 6 serves as an air vessel,

. p yproduces the eii'ect that the air compressed in 386,332, and in swam-land Augustgia'lees.

in onecasing. The direct supply duct from `outside to the air vessel permits of the pump being used as desired, by hand, or theair vessel being vfilled by meansof a source Ofcompressed air, for example a` motor. The removable handle permits of rational packing in a compact space. i I claim: Y

l. A pneumatic pump 'of the classV -described, comprising a pump barrel, a acket through which the barrel extends and forming an air chamber, a plunger arranged for operation in the pump barrel and a T-duct, one arm of which is in communication with the lower end of the air chamber and is provided with a valved discharge nozzle, the other arm of the duct communicatingwith the lower; end of the barrel and having a check valve arranged to close against back` pressure from the air chamber.

. 2. Apneumatic pump as claimed in claim 1, including a standardy on which` the pump barrel is supported, which standard has a bore forming .a portion of the arm of the `T-duct which communicates with the lower end of the pump barrel, and also including a nipple connected to said standard and coupled to the other arm of the duct, the said check valve being arranged in the said nipple.

In testimony whereof I havehereuntoset my hand this 8th day'o July, A. D. 1929. A LEOPOLD SPIRA.

it by the pumping passes out not jerkily but evenly from the air exit opening AA, which is of importance in all cases where a uniform pressure is required, forexample for paint spraying devices'and the like.

The spiral tube 6 can also be dispensedV with, in which oase the entire hollow space between the pump barrel and the jacket forms Vthe air vessel.

The pump described has the advantage over other known transportable pumps with air vessel that in it the air vessel and pump which` are votherwise separated are combined 

